Question: Who was the doctoral adviser to Benedict XVI
Paraphrase: Who advised Benedict XVI on his doctorate?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P184 wd:Q2494 . ?sbj wdt:P31 wd:Q5 } 
Answer: Joseph Fessio, Nabil el-Khoury, Hub Schnackers